diff --git a/util.go b/util.go
index 92cdf20..294fb54 100644
--- a/util.go
+++ b/util.go
@@ -1,6 +1,7 @@
 package goutil
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"math/rand"
@@ -188,3 +189,30 @@ func WeightKeyword(keywords string) string {
 
 	return ""
 }
+
+func MergeMap(m1, m2 string) string {
+	var c1 map[string]interface{}
+	var c2 map[string]interface{}
+
+	if strings.TrimSpace(m1) == "" {
+		return m2
+	}
+	if strings.TrimSpace(m2) == "" {
+		return m1
+	}
+	json.Unmarshal([]byte(m1), &c1)
+	json.Unmarshal([]byte(m2), &c2)
+	if c1 == nil {
+		c1 = make(map[string]interface{})
+	}
+	if c2 == nil {
+		c2 = make(map[string]interface{})
+	}
+
+	for k, v := range c2 {
+		c1[k] = v
+	}
+
+	res, _ := json.Marshal(c1)
+	return string(res)
+}